G2-MMS: Update central mess frontend UI to match G2-MMS backend workf…

[Zapper9982]

Issue that this pull request solves

Closes: N/A

Proposed changes

Brief description of what is fixed or changed

This PR updates the Central Mess frontend UI to align with the new G2-MMS backend workflows.

Key changes include:

• Added updated dashboard layout for Central Mess users.
• Added frontend screens for menu polls and student voting.
• Added mess announcements UI for viewing and managing announcements.
• Added warden decision desk for escalated mess requests.
• Added vacation survey UI for collecting student food preferences.
• Updated registration, deregistration, rebate, special food, payment, menu, feedback, and bill views.
• Updated routes and API integrations to use the new backend endpoints.
• Improved UI consistency across student, caretaker, and warden mess workflows.
• Updated sidebar navigation for the new mess module screens.

Types of changes

Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please describe):

Checklist

Put an x in the boxes that apply

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have created new branch for this pull request
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• My changes does not break the current system and it passes all the current test cases.

Screenshots

Please attach screenshots of the updated Central Mess frontend screens, especially:

• Student dashboard
• Caretaker dashboard
• Warden dashboard
• Menu polls
• Announcements
• Warden decision desk
• Vacation survey

Other information

This frontend PR depends on the corresponding G2-MMS backend API changes being merged/deployed.